A countergambit against White's Bird's Opening: 1. f4 e5 2. fxe5 d6 3. exd6 Bxd6. While this looks pretty tame as gambits go, since no Black piece is aimed directly at White's King, an example of how things can get out of hand is 4. Nf3 g5 5. d4 (or 5. g3) g4 and White is not getting what he expected from the "quiet" and "solid" Bird's Opening.
An interesting possibility is declining the From's Gambit by 2. e4, making the game a King's Gambit. As a matter of psychological chess, Black is already doing well.